KBA-01221: Error: The format of the file “Spitfire.sfPMS.WebDAVHandler” is invalid.


When I try to open the Spitfire website, the following Server Error appears: The format of the file ‘Spitfire.sfpms.WebDAVHandler‘ is invalid.  How can I fix this?


  • In IIS, open the Properties box for your Spitfire website‘s virtual directory.
  • Check the virtual directory‘s ASP.NET tab for the ASP.NET version. Spitfire is a .NET 2.0 application and requires the website to use ASP.NET version 2.0.xxxxx.

Additional Comments:

In the Server Error message web page, check the bottom line. Most likely you‘ll find that the web site is configured to use .NET Version 1.x.xxxxxx as shown below:

Version Information:Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032 

KBA-01221; Last updated: October 13, 2016 at 13:36 pm;